Thanks - I do understand and appreciate that there are a lot of things that are
intertwined and virtually inextricably embedded in POV-Ray, and would take a
major rewrite to fix, or add.
I'll keep plugging away at it. :)

Can you explain what the following excerpt from the docs _means_ ?

"Also, function splines take the vector size into account. That is, a function
containing a spline with five components will also return a five component
vector (aka a color), a function containing a spline with two components will
only return a two component vector and so on. "

What's an example of a working "function spline"?

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